Flight OddsWN3999 SAN → DEN
Southwest Airlines · San Diego, CA to Denver, CO · 39 flights observed, 2025-08-07 to 2025-09-29 · 853 mi
WN3999 covers more than one route in the data window — the stats below are for SAN → DEN, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
49%
Median delay
+18 min
90th percentile
+80 min
Cancellation rate
0%
How often is WN3999 on time?
Across 39 flights on SAN → DEN from 2025-08-07 to 2025-09-29, WN3999 arrived within 15 minutes of schedule 49% of the time. The median arrival delay was +18 min, and the worst 10% of flights arrived +80 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 19 | 49% |
| 16-30 min | 3 | 8% |
| 31-60 min | 7 | 18% |
| 61-120 min | 9 | 23% |
| 2+ hrs | 1 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 18 | 28% | +43 min |
| 2025-09 | 21 | 67% | +25 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 8 | 50% |
| Tue | No data | — |
| Wed | No data | — |
| Thu | 8 | 38% |
| Fri | 8 | 50% |
| Sat | 8 | 38% |
| Sun | 7 | 71% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…